When you press or entice a PC and they resist, ask their player: “Could I possibly get you to do this, yes or no?” If they say “no,” let it drop.
If they say “yes,” you can roll +CHA: on a 10+, they mark XP if they do what you want, and if they don’t, they must say how you could convince them; on a 7-9, they mark XP if they do what you want (but can refuse or make a counter-offer if they like).
(For more information, see Player Moves.)